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After calibration with the correct calibration error parameters, a 1 meter cable connected to the reference plane with short and open at its other end, should give perfect circles spiraling inwards in

QRP RX recently updated his README: https://github.com/qrp73/NanoVNA-Q/blob/master/README.md

Bob, https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20191030105308&SearchText=IP5303 But be careful - some vendors charge big $$ for shipping.

Where to buy IP5303?

Thanks for the image, KVR5 Your hand is steadier for soldering than mine.. @QRP - does the small red mark next to it signify bad hardware?

That's exactly what I do at LC. "You can also connect trap to hot ends of both CH0 and CH1 and do S21 measure without need for coil adapter. It worked for me when I was unable to detach trap from

IF your reply DID NOT start with put-down I would reply....

IF you would have looked in the Files and Wiki sections of the forum - all of your questions would have been answered except #1.There is no trademark - only a copyrighted name, owned by edy555. Check

Sure, but one fixed LPF suffices, rather than LPF tracking swept square wave.

Before purchase I would like to have the following answered / verified Is “NanoVNA” a trade mark? (verify) Is “NanoVNA” open source – both hardware and software ? (verify) “NanoVNA “ is

connect it to CH0, leave CH1 open

There is a testing of hardware, to make sure that it provides adequate measurements. With calibration enabled possible hardware issues will be hidden by calibration. This is why I asked for screenshot

Do the same with load on CH0 and CH1

Cross-talk will change, but better than none. FWIW, CH1 precision is less critical; I use uncalibrated 50 Ohm BNC with SMA adapter.

Hi Hmm, putting two signals into a mixer generates more than one single sinusoidal signal. Bo

As an alternative to mixing and LPF for lower RF, grab an eBay AD9959 board: https://www.eevblog.com/forum/rf-microwave/all-you-need-to-know-about-the-chinese-ad9959-ebay-board/msg2205405/ .. and

I have only 1 50 O at this point...more on order. I wish that we had a vetted supplier of low cost terminators. I can do one port at a time if that is useful. Not sure when to expect the others...have

I think such filters add more cost than starting with sinusoid-generating chips, e.g. /g/nanovna-users/message/5979

Hi Oristo A square wave can be expressed as an infinite number of odd harmonic sinusoidal signals. Thus, a LPF a bit above the fundamental frequency can do the job. Bo

Hi Larry - That can be scripted using my Python utility with multiple scanraw invocations, but current issues are measurement noise and repeatability.